Your body breaks down proteins into simpler substances called

amino acids

Explanation:

Proteins belongs to one of three major classes of food abundant in animal-derived foods (ie: meat) and some vegetables, such as legumes.

When ingested, several enzymes such as PEPSIN and RENIN in the stomach, TRYPSIN in the duodenum act on it to break its peptide bonds, and YIELD one or more long chains of AMINO ACIDS.

So, the END PRODUCT of protein digestion is amino acids

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